[The value of computed tomography in the localization of parathyroid adenomas].
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Value (mathematics)
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Nine cases of intrathoracic lipoma are reported. Computed tomography (CT) proved to be helpful in the diagnosis and management of these cases. The attenuations of the masses ranged from -70 to -140 Hounsfield units (HU). In 4 cases, needle biopsies were taken, confirming lipoma with mature fat cells. One patient also had a coelomic cyst with an attenuation of 20 HU, which was confirmed at thoracotomy. Another had an atypical lipoma which infiltrated the thoracic wall but was benign. In conclusion, we recommended investigation with CT scan for the diagnosis of lipoma.
Thoracotomy
Hounsfield scale
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Computed tomography of the chest is found to be a useful method in selected cases. Lipomas of the chest and mediastinum can be specifically diagnosed. Extent of malignant pulmonary processes can be assessed for resectability, since it can detect mediastinal nodes not properly seen in conventional chest tomography. Computed tomography of the chest is indicated in these two diagnostic problems.
Thorax (insect anatomy)
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Modality (human–computer interaction)
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Objectives To describe the morphologic appearance over time of percutaneously radiofrequency-ablated pulmonary metastases from colorectal cancer and to focus on the occurrence of the most common complications. Methods Twenty patients have been treated with computed tomography (CT)–guided radiofrequency ablation (RFA) for 41 pulmonary metastases using the expandable 14-gauge StarBurst XL RF electrode along with the 1500 generator (RITA Medical Systems, Mountain View, CA). The average number of lesions per patient was 2.05, ranging from 1 to 4 lesions. Results The typical feature of the radiofrequency-ablated site immediately after the procedure was a light bulb–shaped opacification surrounding the probe. This became a more spherically shaped feature over time and steadily decreased in size. At 3 months after RFA, the lesion was approximately the same size as at baseline. The lesion subsequently shrank within the following 3 months, usually with a small scar remaining. Pneumothorax occurred in 50% of the patients, and a chest tube was required in 50% of the patients affected. Cavitation occurred in 24% of the lesions. Intraparenchymal hemorrhage was observed in 7.5% of the cases. Conclusions Image-guided pulmonary RFA is a safe minimally invasive therapy modality with acceptable morbidity. Ablated lesion size usually exceeds the dimensions of the initial tumor for the first 3 months after ablation and continuously shrinks thereafter.
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Conventional radiography
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Conventional linear x-ray tomography is often used to search for pulmonary metastases but tends to underestimate extent of disease when compared with operative findings. In a prospective study, operative findings were correlated with computed axial tomography and conventional linear tomography performed on 25 patients with a history of extrathoracic malignancy and pulmonary nodules. Computed tomography detected 69 nodules of which 31 proved to be metastases. Conventional linear tomography detected 38 nodules of which 25 were metastases. Of the 54 resected nodules measuring >3 mm, computed tomography detected 42; whereas conventional tomography detected 32. Only six of the 31 additional nodules (20%) detected by computed tomography and not by conventional tomography proved to be metastases. These results suggest that computed tomography is more sensitive than conventional tomography in detecting small pulmonary nodules; however, there is diminished specificity in identifying metastatic nodules. Cancer 43:913–916, 1979.
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To determine whether perfusion computed tomography (PCT) adds value to noncontrast head CT (NCT), CT angiogram (CTA), and clinical assessment in patients suspected of acute ischemic stroke.We retrospectively reviewed 165 patients with acute ischemic stroke. PCT was used to calculate the volumes of infarct core and ischemic penumbra on admission. Other imaging data included Alberta Score Program Early CT Score, site of occlusion, and collateral flow. Clinical data included age, time, National Institutes of Health Stroke Scale at baseline, treatment type, and modified Rankin score (mRS) at 90 days. Recanalization status was assessed on follow-up imaging. In a first multivariate regression analysis, we assessed whether volumes of PCT penumbra and infarct core could be predicted from clinical variables, NCT, or CTA, or whether they represented independent information. In a second multivariate regression analysis, we used mRS at 90 days as outcome and determined which variables predicted it best.Of 165 patients identified, 76 had a mRS score of 0 to 2 at 90 days, 89 had a mRS score >2. PCT infarct could be predicted by clinical data, NCT, CTA, and combinations of this data (P<0.05). PCT penumbra could not be predicted by clinical data, NCT, and CTA. All of the variables but NCT and CTA were significantly associated with 90-day mRS outcome. The single most important predictor was recanalization status (P<0.001). PCT penumbra volume (P=0.001) was also a predictor of clinical outcome, especially when considered in conjunction with recanalization through an interaction term (P<0.001).PCT penumbra represents independent information, which cannot be predicted by clinical, NCT, and CTA data. PCT penumbra is an important determinant of clinical outcome and adds relevant clinical information compared with a stroke CT workup, including NCT and CTA.
Penumbra
Stroke
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Objective:The study aimed at evaluating the differences of ultrasonography and Computed Tomography in diagnosis for cholelithiasis.Methods: 250 cases with cholelithiasis were examined after conventional ultrasound and Computed Tomography,we compare the differences of two methods.Results: Computed Tomography is better than Ultrasonography in diagnose hepatic cholelithiasis,but there is no remarkable difference of two diagnostic method for cholecystic stones.Conclusion: Computed Tomography is better for diagnosing extrahepatic stones and we can make use of the two methods for cholelithiasis.
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